It's true about the FIAT connection, under the bonnet they say FIAT Auto on the VIN plate, but more then that, the 156 and 147 dates back to the Tipo platform. Don't let that put you off, for a start off, Fiats handle well, but the platform has been much improved for the Alfa. There are loads of cars that have this sort of connection, SAAB's 93 or 95??? is based on the old Vectra, the Smart forfour is based on Mitsubishi Colt (you can forget them both), so really you need to judge the car on its indivdual merits. As far as rust is concerned, it is rare on Alfas these days, they are galvanised, so if it does go rusty, there has been a galvanising screw up, which I wouldn't imagine happens too often.